This may not help, but a close friend of mine has the Mackies and he reckons they are the one. I've heard them as well and they really are absolutely lush. Haven't go any experience with the Yamahas though.

yer one of my best mates has the mackies an they are truely amazing but i've heard the yamahas are sick too so really wanna hear from someone who has experience with them both, cheers anyway though bruvvaaaa, anyone else?

I just got back from guitar center and heard both the makie MR8s and Yamaha HS80s.

Both are great, both have strong points. Mackies sound better down low, Yamahas are great for mid but cant hit hard low like the mackies. It depends on the kinda music you make, this is just my observation. Remember everyone's ears are different, I would suggest to physically go hear the speakers you want to buy.

I am more sensitive to low frequencies, whereas my salesman was more sensitive to higher frequencies.

For DnB i would go with the mackies, for anything that requirees vocals, mids or highs, go with Yamaha.

I just got back from guitar center and heard both the makie MR8s and Yamaha HS80s.

Both are great, both have strong points. Mackies sound better down low, Yamahas are great for mid but cant hit hard low like the mackies. It depends on the kinda music you make, this is just my observation. Remember everyone's ears are different, I would suggest to physically go hear the speakers you want to buy.

I am more sensitive to low frequencies, whereas my salesman was more sensitive to higher frequencies.

For DnB i would go with the mackies, for anything that requirees vocals, mids or highs, go with Yamaha.

Id say get the yamahas and a decent active sub to monitor the bass frequencies.
But this isnt a cheap option.
I have a pair of ns10's when i was younger and they where the bollox, i didnt appreciate them though as i didnt produce i only mixed.